Improvement in derricks



h, as shown.

Q, ettel-v itste stenti @Massese-ww @time ANGS CAMPBELL, 'OF DOWNEVILLE, CALIFORNIA.

Letters .Patent No. 85,279, {Za-ted December 29, 1868.*y

IMPROVEMENTIN DERRICKS.

'fl'he Schedule referred to in these Letters Patent'and maldng part of the same.

To all whom t't limag/'concern: Be it' known that I, ANeUs CAMPBELL, ot' Downieville, in the county of Sierra, and State of California,'

have invented a new and improved Derrick; and I do hereby declare that the following is a full, clear, an d ex? act description thereof, which will enable others skilled in vthe-art to make and use Vthe same, reference being had to the accompanying drawing, forming part of this I Figure 4 is adetail side View of my improved safetyhook.

Similar letters of reference indicate like parts. This invention relates to various improvements on derricks, whereby the operation of loading and unloading articles om and into ships and other receptacles can be greatly facilitated.

The invention consists, first, in the use of a truck which slides on the boom; second, in the application of an endless rope for bracing the boom without interfering with the motion of the truck, and without overstraining the topping-lift.

The invention also consists of a safety-hook,for adjusting and suspending the tripping-device.

A represents a mast, of suitable kind, set up on a frame, ship, or other suitable structure.

On it is arranged a boom, B, which can be swung up and down, and which lis, at the end, braced bya rope, C, from the'top or upper part of the same.

D is a truck, running 'on the boom B.

It is constructed of a bow, et, to which a top frame, l, and a bottom frame, c, are pivoted, as is clearly shown in gs. 1 and 3;

In the end of each frame, l1 and c, is a concaveroller, el, which fits the boom, as shown. The truck can thus move back'and forth on the boom as on a rail, and' can, besides, be used as its own brake.

By putting the. two front ends, or the rear ends of the pivoted frames l) c together, by means of any suitable rope or'cord, the rollers at that end will be drawn together, and will constitute a brake for clamping the' boom.

The truck can also be strengthened by meansA of longitudinal ends gg, pivoted to the two sides of the bow a, and connected at ltheends by means of rings 'h' By means A-of a rope, E, which is attached to the front ends of the truck, and which passes over sheaves e, in front of the boom, the truck can be pulled forward.

By another rope, F, which is fastened with one end to the mast, and which is pnt around a sheave, j; that is fastened to the back of the truck, the latter can be hauled backward.

O is the topping-lift, fastened with one end to the front end of the boom, passed over a roller, G, that is on the top of the mast, and then down'. lt serves to brace the boom, and to adjust the same in-a hori'ontal `or inclined position.

To take the strain from this rope C, I have arranged a rope, G.4

The same is with one end fastened to the front end of the truck, on one side of the same, is then passed around a roller, h, which is attached to the 'ont part of the boom.

The rope is then passed back, in a horizontal direction, over a roller, r, which has its bearings in the lower part ofthe mast, then up, over a roller, j, on the upper part of the mast, then down, over a sheave, k, which is fastened to and projects from the truck, then up, over a sheave, I, which is suspended from the upper part of the mast, then down, over k, and back again, over rollers j, i, and h, which are arranged on the mast and boom respectively, opposite to the rollers j, i, and before mentioned, and has its other end attached to the other side, near the front end of the truck.

The rollers h 71, have their bearings in bars or blocksV l en m, that are tted to opposite sides of thc boom, near the front end ofthe same, and that are clamped together by means of a metal ball, n.

rlhe rollers t' are loosely fitted upon a rodo, Which is fixed in the ring p, bywhich the boom is fastened to the mast.

The rollers j j have their bearingsin arms e* fr, that' project downward from a ring, s, fitted around the upl per partof the mast.

The rollers gandl are suspended from .the same ling, s, so that the ropes G and C may follow the motion of the boom, should the.' same be swung around the mast.

The sheave K is fastened, by means of a hook,'H, to a hook or staple, t, which is swivelled to a ball, u, pivoted to the truck, as shown.

The hook H is closed by means of a link, v, and ring w.

The link is pivoted to the end of the hook, and the ring fits loosely around the hook-shank, and rests on a nut, x, which works on the shank of the hook.

From the -rig w projects a pin, 1, over which the link is fitted, as shown.

The hook is closed, so that it cannot "be taken, off the staple t when the nut is screwed high enoughto prevent the link being taken olf the pin y. By lowering the nut,the link can be swung down and the hook opened. i

Instead of having the link pivoted to the bill of the hook, it may, in iig. 4, be pivoted to the pin y, and he iitted over the downward-bent end ofthe hook H.

The ring w, instead of being supported by the nut fr, may be fitted around thesame, as shown in fig. 4.

By means of the rope G. the boom will be braced so that a great part of the strain is taken from the topping-lift. If the truck is moved back or forth on the A boom, the rope G will adjust itself, and will always brace the boom in the same manner.

' In 2 is shown a substitute for the rod o and rollersi. This consistsof a crank-shaft, I, which is to have its bealrngs'in lugs projecting from the ring p, and which carries drums z, with spiral grooves. as shown.

The rope G would be fitted around these drums, land when the shaftis turned the horizontal part of the rope would be wound around them, thereby hauling the truck forward. ln this ease the rope Gwculd not only serve to brace the boom, but also to haul the truck forward.

J is a tackle-block, suspended, by means of a rope, L, from the truck. p

This rope is fastened with one end to a block, M, that is suspended from the truck, is then passed around J, then over the sheave of M, then through tackle-block N,fastened to the frontend of the boom. Iand then down or back to the mast.

By means of the rope L, the weight suspended from the block J can be raised or lowered.

To the block J .is pivoted a hook, H, constructed like the hook H above described.

p Through it is drawn a chain or rope, O, to the ends of whiclrrings u b are respectively attached. The end having the ring b is drawn throughth'e ring a.

The ring a." is also fitted through the upper end of a bar or rod, P, to the lower end of which a short arm, c', is pivoted.

To the upper part of the barP is pivoted a level', R. The weight to be elevated or conveyed is fastened by drawing the chain O around it, the ring b' is then put over the arm c', the free end of which is then locked into a notch, forming'th'e lever R, as shown in iin'. l.

The weight is thus firmly secured, and can be raised to any desired height by means of the rope L, and broughtover any desired spot byswinging the boom.

When it is to be released, the lever l is swung up by pulling a trip-cord, LZ, which isa-ttached to the free end of said lever, and passes over a roller, c', on Vthe truck, and one, j", on the mast, as shown. Instead of the truek, a slide of other description may be used on lthe hooin, in connection with my other improvements.

Having,r thus described my invention,

I claim as new, and desire to secure by Letters Patent Ll. The truck D, cmisisting of the bow a, swinging flames b c, and concave rollers d, substantially as herein shown and described. l

2. The rope G, when arranged as described, to brace the boom, by being fastened to the truck sliding thereon, for the purpose of relieving; the topping-lift C, as specified. f

3. The hook H, having the nut-cv, ring w, and link o, arranged substantially as and for the purpose herein shown and described. 1

4. The chain O, bar P, lever R, and arm c', in co1ubination with the hook H, nut I, ring w, and link c, arranged as described for the purpose specified.

The above specification of my invention signed by me, this 31st day ot' March, 1868.

ANGUS CAMPBELL. Witnesses:

Josera Bene, JERRY WILLIAMS. 

